Question

netstat output.

Asked by: wasadmin11

my solaris 10g netstat -s -P tcp output shows

 netstat -s -P tcp

TCP     tcpRtoAlgorithm     =     4     tcpRtoMin           =   400
        tcpRtoMax           = 60000     tcpMaxConn          =    -1
        tcpActiveOpens      =8541985    tcpPassiveOpens     =6636375
        tcpAttemptFails     =1178102    tcpEstabResets      =3970089
        tcpCurrEstab        =   353     tcpOutSegs          =637870813
        tcpOutDataSegs      =4264494647 tcpOutDataBytes     =4158460100
        tcpRetransSegs      =970083     tcpRetransBytes     =752333425
        tcpOutAck           =782158233  tcpOutAckDelayed    =162812268
        tcpOutUrg           =  1802     tcpOutWinUpdate     =250042
        tcpOutWinProbe      = 22831     tcpOutControl       =30072847
        tcpOutRsts          =4856638    tcpOutFastRetrans   =158459
        tcpInSegs           =3515848471
        tcpInAckSegs        =2150305032 tcpInAckBytes       =102418816
        tcpInDupAck         =111470035  tcpInAckUnsent      =     0
        tcpInInorderSegs    =1902119247 tcpInInorderBytes   =3071923912
        tcpInUnorderSegs    =37571088   tcpInUnorderBytes   =3757513348
        tcpInDupSegs        =622698     tcpInDupBytes       =376009442
        tcpInPartDupSegs    =  3469     tcpInPartDupBytes   =2467874
        tcpInPastWinSegs    =     5     tcpInPastWinBytes   =  6900
        tcpInWinProbe       =  1226     tcpInWinUpdate      = 22357
        tcpInClosed         =3318785    tcpRttNoUpdate      =172459147
        tcpRttUpdate        =1970102865 tcpTimRetrans       =609222
        tcpTimRetransDrop   =  1108     tcpTimKeepalive     =114978
        tcpTimKeepaliveProbe=  3187     tcpTimKeepaliveDrop =    13
        tcpListenDrop       =  8341     tcpListenDropQ0     =     0
        tcpHalfOpenDrop     =     0     tcpOutSackRetrans   =   806


what are the parameters I need to check to know if there are errors in my network. I see tcpListenDrop is non zero.

Please explain the important parameters to look for ? and what ndd parameters i need to change if needed

Thanks in Advance !

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Asked On
2009-10-20 at 03:31:26ID24826311
Tags

netstat

,

unix

,

unix performance

,

network errors

Topics

Unix Networking

,

Network Auditing Software

,

IBM Websphere Application Server

,

Sun Solaris

,

Oracle Database

Participating Experts
2
Points
500
Comments
15

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Answers

 

by: gheistPosted on 2009-10-20 at 07:05:56ID: 25614236

/usr/sbin/ndd /dev/tcp tcp_ip_abort_cinterval
/usr/sbin/ndd /dev/tcp tcp_conn_req_max

what your observation means - conn_req_max connections was not served in 3min time, or there were more connections coming in.
First rise later to something like 1024 to offload TNS a bit using little kernel resources.
If that does not help - sometimes TNS is hopeless and probably needs more backends and they need more RAM.
PS this is a per-connection structure, you have to reastart TNS after changing system setting

If your clients are over slow or noisy links results ar fine. Some retransmits etc.

 

by: wasadmin11Posted on 2009-10-22 at 20:50:40ID: 25641243

Moderators , can u please look into this ?

 

by: gheistPosted on 2009-10-23 at 05:24:52ID: 25643658

uname -a?
Affected application(s)?

 

by: bittiPosted on 2009-10-23 at 11:12:32ID: 25646870

Hi,

Hi, if tcpListenDrop increase means that your database is receiving a high number of connect request on database listener. Default value of max unfinished connections that can be handled by Oracle Listener simultaneously  is 5.

To increase this value, use the QUEUESIZE parameter on listener.ora.

eg.:
[...]
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = XXXXX)(PORT = 1521)(QUEUESIZE = 64))
[...]

The max value that QUEUESIZE can be configured is limited by tcp_conn_req_max_q (default value is 128)

I think that queuesize in 64 will increase the listener throughput and avoid tcpListenDrop.

Regards
 

 

by: wasadmin11Posted on 2009-10-24 at 08:43:04ID: 25652686

The application running on the box is WebSphere and WebSphere MQ with some java applications.  Regarding uname -a , i will check it on monday as today i dont have access.(its a Sun Solaris 10.g box)
 
There is also oracle client on the box which connects to over 20 Oracle 10g (with RAC) databases via JDBC

 

by: wasadmin11Posted on 2009-10-26 at 02:20:57ID: 25660630

uname -a SunOS red 5.10 Generic_118833-18 sun4v SUNW, Sun-Fire-T200,

applications affected :WebSphere

I think bitti's answer is close , the only thing is this is not a oracle server. It looks like my server may be receiving more requests from the webserver. I still want to analyse the errors in the netstat output .

 

by: gheistPosted on 2009-10-26 at 07:13:19ID: 25662405

Do you ahve any track of how application is affected?

-Xincgc fro sun jvm

 

by: wasadmin11Posted on 2009-10-26 at 07:51:52ID: 25662792

Application is slow.  GC is fine.  I believe if i can analyse the netstat output , I can determine if the network has any issues

 

by: gheistPosted on 2009-10-26 at 10:02:17ID: 25664341

tcpListenDrop       =  8341  

Nope - your application is not keeping up with the network speed.
What system can help is in first post, rest is with the websphere and apps inside.

System accounting is able to help also.

 

by: wasadmin11Posted on 2009-10-26 at 20:08:12ID: 31643304

netstat -s -p tcp output has  many parameters to be analysed. I got  a partial analysis based on the tcpListenDrop parameter which i suggested. I was looking for a more comprehensive analysis of the major parameters.

 

by: wasadmin11Posted on 2009-10-28 at 04:04:55ID: 25681822

ModEErf,

I appreciate gheist efforts to answer my question. As you can see I have already given the reason for awarding C .

netstat -s -P tcp output has lots of parameters to be analysed. The answers I got were vague. I have also provided all the info required by gheist  . I do understand , sometimes its not possible to give a satisfactory answer.  There is a lot of tcp errors which creates issues to WebSphere and a deep dive analysis of the netstat output  is needed to interpret not just one parameter (which i myself suggested)

Any other suggestions from the experts are welcome  !


Thanks

wasadmin11

 

by: gheistPosted on 2009-10-28 at 08:10:33ID: 25684107

I have analyzed your input and figured out only parameter that is anomaly with SYSTEM.
On the network side since your application is TOO SLOW there is little reason to address 1/5 of traffic added as retransmit.

20120131-EE-VQP-002

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